Vadim Slavin, David H. Laidlaw, Song Zhang, Rovert Pelcovits, George Loriot,
  and Anderw Callan-Jones.
  <b>Visualization of Topological Defects in Nematic Liquid
  Crystals Using Streamtubes, Streamsurfaces and Ellipsoids</b>.
  IEEE Visualization 2004 Poster Compendium, October 2004.
  <A HREF="http://vis.cs.brown.edu/docs/pdf/bib/g/Slavin-2004-VTD.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/docs/ppz/bib/g/Slavin-2004-VTD.ppz.html">(ppz)</A>
  <A HREF="http://vis.cs.brown.edu/docs/zip/bib/g/Slavin-2004-VTD.zip.html">(zip)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Slavin-2004-VTD.bib">(bibtex:
  Slavin-2004-VTD)</A>.<br />